Jules Richardson wrote (regarding sync separation):
Unfortunately I don't have an LM1881 chip in the
spares pile :-(
I could have sworn there was an easier way though
Jochen wrote:
You can use an OPA wired as a comparator too. Set the
switch level to
about 0.15 V and you get C-sync out of the comparator. The black level
of a video signal is 0.3 V. Everything below down to 0 V is sync. You
should use a TTl IC behind the comparator as a line driver.
Won't work reliably if the video is AC-coupled, which is *very* common.
The LM1881 (and the improved-spec EL4581) are designed to deal with
that.